Plex Now Transcoding x264 to Devices that previously Direct Streamed/Played

Plex Players
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I’m trying to play x264 mp4/mkvs on a Chromecast from a phone/tablet. It just sits. x264 should be a direct stream/direct play codec for nearly ANY device in the last 10 years. Those same files work just fine on SmartTV apps and PCs, as well as playing locally on a phone itself.